THE PT30 & PT40 ARE CRELANT’S SMALLEST 18650 LIGHTS TO DATE The newest PT series are designed for simplicity. These are single output lights using a silent tactical switch. a simple twist of the switch for constant on or press for momentary. The primary differences between the lights are the head size, the PT40 has a larger head with a deeper reflector. both have a smooth reflector.
On other sites I read that PT40 is dual mode (high-low) has stepless regulation, on CPf Crelant wrote that it has “tactical side switch with infinite brightness system”. But if they really are single mode that’s a huge drawback today because of limited usability and short runtime.